Wi-fi testing instrument



FIG. 1 is a perspective view of the design for a network testing instrument;

FIG. 2 is a front view of the design of FIG. 1;

FIG. 3 is a left side view of the design of FIG. 1;

FIG. 4 is a right side view of the design of FIG. 1;

FIG. 5 is a bottom end view of the design of FIG. 1;

FIG. 6 is a top end view of the design of FIG. 1; and,

FIG. 7 is a rear view of the design of FIG. 1.

The broken lines showing in the drawings are for illustrative purposes only and forms no part of the claimed design. 

We claim the ornamental design for a network testing instrument, as shown and described. 